Brian/misc fxns

contracts/viewer/ProtocolViewer.sol

@@ -19,6 +19,7 @@ pragma experimental "ABIEncoderV2";
 
 import { ERC20Viewer } from "./lib/ERC20Viewer.sol";
 import { ManagerViewer } from "./lib/ManagerViewer.sol";
+import { OracleViewer } from "./lib/OracleViewer.sol";
 import { RebalancingSetTokenViewer } from "./lib/RebalancingSetTokenViewer.sol";
 import { TradingPoolViewer } from "./lib/TradingPoolViewer.sol";
 import { CTokenViewer } from "./lib/CTokenViewer.sol";
@@ -35,8 +36,8 @@ import { CTokenViewer } from "./lib/CTokenViewer.sol";
  /* solium-disable-next-line no-empty-blocks */
 contract ProtocolViewer is
     ERC20Viewer,
-    RebalancingSetTokenViewer,
     TradingPoolViewer,
     CTokenViewer,
-    ManagerViewer
+    ManagerViewer,
+    OracleViewer
 {}

contracts/viewer/lib/OracleViewer.sol

@@ -0,0 +1,55 @@
+/*
+    Copyright 2020 Set Labs Inc.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+pragma solidity 0.5.7;
+pragma experimental "ABIEncoderV2";
+
+import { IOracle } from "set-protocol-oracles/contracts/meta-oracles/interfaces/IOracle.sol";
+
+
+/**
+ * @title OracleViewer
+ * @author Set Protocol
+ *
+ * Contract for fetching oracle state
+ */
+contract OracleViewer {
+    /*
+     * Fetches RebalancingSetToken liquidator for an array of RebalancingSetToken instances
+     *
+     * @param  _rebalancingSetTokens[]       RebalancingSetToken contract instances
+     * @return address[]                     Current liquidator being used by RebalancingSetToken
+     */
+    function batchFetchOraclePrices(
+        IOracle[] calldata _oracles
+    )
+        external
+        returns (uint256[] memory)
+    {
+        // Cache length of addresses to fetch states for
+        uint256 _addressesCount = _oracles.length;
+
+        // Instantiate output array in memory
+        uint256[] memory prices = new uint256[](_addressesCount);
+
+        // Cycles through contract addresses array and fetches the current price of each oracle
+        for (uint256 i = 0; i < _addressesCount; i++) {
+            prices[i] = _oracles[i].read();
+        }
+
+        return prices;
+    }
+}